686686653 has 28 divisors (see below), whose sum is σ = 1044138528. Its totient is φ = 451309320.

The previous prime is 686686579. The next prime is 686686687. The reversal of 686686653 is 356686686.

686686653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 686686653 - 2⁸ = 686686397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 686686653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686686153) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 45126 + ... + 58392.

Almost surely, 2^686686653 is an apocalyptic number.

It is an amenable number.

686686653 is a deficient number, since it is larger than the sum of its proper divisors (357451875).

686686653 is an equidigital number, since it uses as much as digits as its factorization.

686686653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13356 (or 13341 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 54.

The square root of 686686653 is about 26204.7066955538. The cubic root of 686686653 is about 882.2388982184.

The spelling of 686686653 in words is "six hundred eighty-six million, six hundred eighty-six thousand, six hundred fifty-three".